Interactive Box Plot - students enter data and make their own scatterplot with this National Library of Virtual Manipulatives page

Mean and Median - this applet allows the user to investigate the mean, median, and box-and-whisker plot for a set of data that they create

Measures of Spread: Box and Whisker Plots - from the Australian Bureau of Statistics - includes suggested problems to assign [This expired page is brought to you by the Internet archive, the Wayback Machine.]